21 November, 1997
Hi Everyone, What a busy day!!!!!! We are still working on permeabilities for Dr. Albert but we got to visit with her on some of her other projects that are really neat. She had dug a pit into the snow and then looked at the layers of snow that were there. The pit was between 2.5 and 3 meters high. She said it was probably only two to three year ës worth of snow. Inside the pit, you can see layers of snow just like layers of rock along a highway. She can identify the snow that has fallen during the winter and the crust that is on top of the snow here from the wind by the size of the snow firn. There is also a layer of hoar frost which is soft and has large crystals and you can pick out with your finger nail. Hoar frost is just frost that lands on everything around here when any moisture in the air freezes. Just like at home. The only difference is that the frost here is a lot thicker than at home and it does not melt. The layers are really neat. If there is any light coming through from the otherside of the wall, the whole thing has different colors of blue. Joey Tsai, a high school student with us, wrote his name in a pit wall and it is definitely blue. Dr. Albert is also measuring sustrugi (snow dunes) heights and what the wind does to them. It was fun watching her place a large board behind the sustrugi and measure how far from the top of the board the snow was. You could actually see the shape of the snow dune on the board when they pushed into the ground. Iíll bet that you could do this with a bunch of sand. Try building a sand dune with an odd shape. Push a piece of cardboard into the top of your sand dune. Take a crayon and trace the top of the sand dune on your cardboard. See it would look very much like one of our sustrugi.Return to E. Shackleton Bear's Page
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